4
RS232 - RS485
RS232 - RS422
TD(A)
TD(B)
RD(A)
RD(B)
GND
12V
TD(A)
TD(B)
RD(A)
RD(B)
GND
12V
A/C
Adaptor
Fig. 1: Component Wiring Diagram
black
black/white
Cable Connection
The twisted-pair cable should be connected to the two convert-
ers and the A/C adaptor as shown in figure 1.
IMPORTANT: the wire connected to a Transmit Data terminal
[TD(A) or TD(B)] of one converter must be connected to the
corresponding Receive Data terminal [RD(A) or RD(B)] of the
other converter.
The ground (GRD) and voltage (12V) terminals of one con-
verter should be connected to the corresponding terminal of the
other. The black wire from the A/C adaptor is connected to the
GRD terminal of the RS232-RS485 converter. The black/white
wire connects to the 12V terminal.
If the case of the 03349CB RS422 Converter has been closed,
it can be opened by inserting a screwdriver in the side slots and
rotating to separate the halves.
Note: The twisted pair cable should be run through the
right-
most
hole in the bottom of the weather station enclosure
be-
fore
connecting to the RS232-RS422 converter. The RS232-
RS422 converter will then rest inside the weather station enclo-
sure (see photo on page 6).
PC End
Weather Station End
